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          android引入ffmepg库
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              <time title="创建时间：2020-08-01 08:48:40 / 修改时间：08:56:31" itemprop="dateCreated datePublished" datetime="2020-08-01T08:48:40+08:00">2020-08-01</time>
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<p>把FFmpeg编译出来的动态库添加到项目中，利用cmake进行配置，并测试是否导入成功</p>
</blockquote>
<h2 id="具体步骤"><a href="#具体步骤" class="headerlink" title="具体步骤"></a>具体步骤</h2><ol>
<li><p>AndroidStudio创建项目</p>
<p>选择<code>NativeC++</code>项目模板，有的时候找不到是因为在最下面</p>
</li>
<li><p>添加FFmpeg库</p>
<ul>
<li><p>添加<code>include</code>（ffmpeg头文件）文件夹到<code>cpp</code>文件夹下</p>
</li>
<li><p>在<code>cpp</code>文件夹下添加一个<code>libs</code>文件夹，在文件夹下添加对应的cpu架构的文件夹，并把对应的动态库拷到文件夹中</p>
<p><img src="https://i.loli.net/2020/08/01/LehrDSWyxqQsfY7.png" alt="image-20200801083531136"></p>
</li>
</ul>
</li>
<li><p>配置CMakeLists.txt文件</p>
<figure class="highlight cmake"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#要求最低的cmake版本</span></span><br><span class="line"><span class="keyword">cmake_minimum_required</span>(VERSION <span class="number">3.4</span>.<span class="number">1</span>)</span><br><span class="line"><span class="comment">#添加我们编写的动态库</span></span><br><span class="line"><span class="keyword">add_library</span>(native-lib SHARED native-lib.cpp)</span><br><span class="line"><span class="comment">#添加头文件目录</span></span><br><span class="line"><span class="keyword">include_directories</span>(<span class="keyword">include</span>)</span><br><span class="line"><span class="comment">#设置一个文件目录变量</span></span><br><span class="line"><span class="keyword">set</span>(lib_src_DIR <span class="variable">$&#123;CMAKE_SOURCE_DIR&#125;</span>/libs/armeabi-v7a)</span><br><span class="line"><span class="comment">#添加ffmpeg库</span></span><br><span class="line"><span class="keyword">add_library</span>(avcodec SHARED IMPORTED)</span><br><span class="line"><span class="keyword">add_library</span>(avformat SHARED IMPORTED)</span><br><span class="line"><span class="keyword">add_library</span>(avutil SHARED IMPORTED)</span><br><span class="line"><span class="keyword">add_library</span>(swresample SHARED IMPORTED)</span><br><span class="line"><span class="keyword">add_library</span>(swscale SHARED IMPORTED)</span><br><span class="line"><span class="keyword">add_library</span>(avfilter SHARED IMPORTED)</span><br><span class="line"><span class="comment">#设置ffmpeg的路径</span></span><br><span class="line"><span class="keyword">set_target_properties</span>(avcodec PROPERTIES IMPORTED_LOCATION</span><br><span class="line">        <span class="variable">$&#123;lib_src_DIR&#125;</span>/libavcodec.so)</span><br><span class="line"><span class="keyword">set_target_properties</span>(avformat PROPERTIES IMPORTED_LOCATION</span><br><span class="line">        <span class="variable">$&#123;lib_src_DIR&#125;</span>/libavformat.so)</span><br><span class="line"><span class="keyword">set_target_properties</span>(avutil PROPERTIES IMPORTED_LOCATION</span><br><span class="line">        <span class="variable">$&#123;lib_src_DIR&#125;</span>/libavutil.so)</span><br><span class="line"><span class="keyword">set_target_properties</span>(swresample PROPERTIES IMPORTED_LOCATION</span><br><span class="line">        <span class="variable">$&#123;lib_src_DIR&#125;</span>/libswresample.so)</span><br><span class="line"><span class="keyword">set_target_properties</span>(swscale PROPERTIES IMPORTED_LOCATION</span><br><span class="line">        <span class="variable">$&#123;lib_src_DIR&#125;</span>/libswscale.so)</span><br><span class="line"><span class="keyword">set_target_properties</span>(avfilter PROPERTIES IMPORTED_LOCATION</span><br><span class="line">        <span class="variable">$&#123;lib_src_DIR&#125;</span>/libavfilter.so)</span><br><span class="line"><span class="comment">#链接库 注意顺序</span></span><br><span class="line"><span class="keyword">target_link_libraries</span>(</span><br><span class="line">        native-lib</span><br><span class="line">        avformat avcodec avutil avfilter swresample swscale</span><br><span class="line">        log</span><br><span class="line">)</span><br></pre></td></tr></table></figure>
</li>
<li><p>编写测试接口</p>
<p><code>MainActivity.class</code></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MainActivity</span> <span class="keyword">extends</span> <span class="title">AppCompatActivity</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// Used to load the 'native-lib' library on application startup.</span></span><br><span class="line">    <span class="keyword">static</span> &#123;</span><br><span class="line">        System.loadLibrary(<span class="string">"native-lib"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onCreate</span><span class="params">(Bundle savedInstanceState)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">super</span>.onCreate(savedInstanceState);</span><br><span class="line">        setContentView(R.layout.activity_main);</span><br><span class="line"></span><br><span class="line">        <span class="comment">// Example of a call to a native method</span></span><br><span class="line">        TextView tv = findViewById(R.id.sample_text);</span><br><span class="line">        tv.setText(stringFromJNI() + <span class="string">"\nffmpeg版本:"</span> + getFFmpegVersion());</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * A native method that is implemented by the 'native-lib' native library,</span></span><br><span class="line"><span class="comment">     * which is packaged with this application.</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">native</span> String <span class="title">stringFromJNI</span><span class="params">()</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">native</span> <span class="keyword">static</span> String <span class="title">getFFmpegVersion</span><span class="params">()</span></span>;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><code>native-lib.cpp</code></p>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;jni.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;string&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;android/log.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//打印日志宏  __VA_ARGS__ 代表... 可变参数</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> LOGE(...) __android_log_print(ANDROID_LOG_ERROR,<span class="meta-string">"JNI"</span>,__VA_ARGS__);</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//因为ffmpeg是纯C代码，要在cpp中使用则需要使用</span></span><br><span class="line"><span class="keyword">extern</span> <span class="string">"C"</span> &#123;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;libavutil/avutil.h&gt;</span></span></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">extern</span> <span class="string">"C"</span> JNIEXPORT jstring JNICALL</span><br><span class="line">Java_com_song_ndk1_MainActivity_stringFromJNI(</span><br><span class="line">        JNIEnv *env,</span><br><span class="line">        jobject <span class="comment">/* this */</span>) &#123;</span><br><span class="line">    <span class="built_in">std</span>::<span class="built_in">string</span> hello = <span class="string">"Hello from C++"</span>;</span><br><span class="line">    <span class="keyword">return</span> env-&gt;NewStringUTF(hello.c_str());</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">extern</span> <span class="string">"C"</span></span><br><span class="line">JNIEXPORT jstring JNICALL</span><br><span class="line">Java_com_song_ndk1_MainActivity_getFFmpegVersion(JNIEnv *env, jclass clazz) &#123;</span><br><span class="line">    <span class="comment">//通过av_version_info()获取ffmpeg本号</span></span><br><span class="line">    <span class="keyword">return</span> env-&gt;NewStringUTF(av_version_info());</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

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